<!doctype html>
<html>
  <head>
    <meta charset="utf-8"/>
  </head>
  <body>
    hello, it works.
    <canvas id="canvas" width="600" height="600"></canvas>
    <script>
      var canvas = document.getElementById("canvas");
      var cxt = canvas.getContext("2d");
      cxt.moveTo(10, 10);
      cxt.lineWidth = 1;
      cxt.lineTo(100, 100);
      cxt.stroke();
      alert("draw canvas");
    </script>
  </body>
</html>
